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Which of the following materials acts as a perfect diamagnet at very low temperatures?
The NCERT 'POINTS TO PONDER' states: 'There exists a perfect diamagnet, namely, a superconductor. This is a metal at very low temperatures. In this case $\chi = -1$, $\mu_r = 0$, $\mu = 0$. The external magnetic field is totally expelled.'
What is the relationship between magnetic permeability ($\mu$), relative magnetic permeability ($\mu_r$), and magnetic susceptibility ($\chi$)?
According to the NCERT summary: 'The three quantities, $\chi$, the relative magnetic permeability $\mu_r$, and the magnetic permeability $\mu$ are related as follows: $\mu = \mu_0 \mu_r$, $\mu_r = 1 + \chi$. Therefore, $\mu = \mu_0 (1 + \chi)$.
How does a current-carrying solenoid behave in terms of magnetism?
The NCERT text states: 'The resemblance of magnetic field lines for a bar magnet and a solenoid suggest that a bar magnet may be thought of as a large number of circulating currents in analogy with a solenoid.' It further notes that a bar magnet and a solenoid produce similar magnetic fields, and one can verify this by observing compass needle deflections.
What is the net magnetic flux through any closed surface, according to Gauss's law for magnetism?
The NCERT summary states: 'Gauss’s law for magnetism states that the net magnetic flux through any closed surface is zero $\oint \vec{B} \cdot d\vec{S} = 0$.' This is a direct consequence of the non-existence of magnetic monopoles.
If a bar magnet is broken into two halves, what happens to its magnetic properties?
The NCERT text specifies: 'If a bar magnet is broken into two halves, we get two similar bar magnets with somewhat weaker properties.' It also reiterates that magnetic monopoles do not exist.
Which of the following motions is an example of periodic motion but NOT oscillatory motion?
According to the NCERT text, 'Circular motion is a periodic motion, but it is not oscillatory.' Oscillatory motion specifically involves movement to and fro about a mean position. Orbital motion of a planet is periodic as it repeats after a fixed interval, but it does not oscillate about a mean position.
What is the primary characteristic that distinguishes oscillatory motion from general periodic motion?
The NCERT text states, 'Here, the object moves to and fro about a mean position. The pendulum of a wall clock executes a similar motion. Examples of such periodic to and fro motion abound... Such a motion is termed as oscillatory motion.' While all oscillatory motions are periodic, not all periodic motions are oscillatory.
If the period of an oscillatory motion is T, after what time interval will the motion identically repeat itself?
The 'POINTS TO PONDER' section states: 'The period T is the least time after which motion repeats itself. Thus, motion repeats itself after nT where n is an integer.' While T is the least time, the motion also repeats after any integral multiple of T.
What is the relationship between frequency ($ \nu $) and period (T) of a periodic motion?
The 'SUMMARY' section states: 'The period T is the time required for one complete oscillation, or cycle. It is related to the frequency $ \nu $ by, $ \nu = 1/T $.'
What is the SI unit of frequency?
The 'SUMMARY' section specifies: 'The frequency $ \nu $ of periodic or oscillatory motion is the number of oscillations per unit time. In the SI, it is measured in hertz : 1 hertz = 1 Hz = 1 oscillation per second = $ 1s^{-1} $.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.